Shozo Iwaki (Sakaguchi) is on
assignment in South America when he receives word that his father,
prominent crime boss Kenzo Iwaki (Akaji Maro) has just been
assassinated. Upon arriving back home and learning that the man
responsible is none other than Kurawaki (Shingo Tsurumi) – his late
father’s right-hand man – Shozo sets out to deliver bloody payback.

In the explosive battle that follows,
Shozo loses and arm and a leg and Kurawaki is knocking on death’s door.
Later awakening in a clandestine operating room with an M61 Vulcan
cannon for a right arm and a rocket launcher for a left leg, the
vengeful Shozo realizes he’s been given a second chance to settle his
score with Kurawaki.

Meanwhile, the backstabbing gangster has
transformed Shozo’s best friend Tetsuo (Jun Murakami) into a
drug-crazed killer, and dispatched him on a mission to kill Shozo on
sight. Now in order to get to Kurawaki, Shozo will have to go through
his best friend first.